Spate · Slate · North Wales / Gwynedd / Eryri, GB-WLS

Ogwen

The Ogwen river flowing from Llyn Ogwen with the peak of Tryfan rising behind it.
Poor · Atlantic Salmon
Cascade · 10-14
Slow going — better windows ahead
River lifting fast on the rain. Little in your favour today. Fish the certain lies, or leave it for a better one.
40% confidence
limited data
What moved it
  • LevelProxyvia Seiont
  • Water temp11.8°C
  • ClarityVery colouredColouring up
Today's fly
Cascade
Cascade10-14
Regional salmon default — river-specific evidence is thin.
Conditions on the water
Proxy gauge
Level
Rising
Proxy
via Seiont
Water temp11.8°C
ClarityVery coloured
Weather11°C
WindNW 26 km/h
Pressure1018 hPa
Rain · recent0.5 mm
Rain · ahead16.3 mm

No gauge on this water — conditions are inferred from Seiont. The trend transfers, the absolute level does not.

Water temperature for Atlantic Salmon
Ideal
12°C est.ideal 10–16°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Summer through autumn. Fish on the drop after rain — 6 to 12 hours into a falling spate. Grilse from July.
Where
Lower Ogwen pools through the slate-walled stretches above the tidal limit at Aber.
Method
Small doubles 10 to 12 across-and-down on a floating line; small tubes on a sink-tip in spring or coloured water. Fish the named lies in each pool, working systematically before moving on. Mandatory catch-and-release under NRW byelaw — every salmon goes back.
Kit
10 ft #7/8 single-hander or 11 ft switch — small spate scale; double-handers are wasted on these rivers. Floating line plus light sink-tip. 10 to 12 lb fluoro tippet.
Why this works
Poor — water temperature is working for you, but water clarity is the limiting factor today.
Likely species
Stoneflies
Hatch timeline · todayPeak at 11 Uhr

Hatch predictions

Today's headline hatch shown — see all 12 active hatches hour by hour as a supporter.

Start free trial

14-day free trial. Cancel anytime.

Sub-surface · on the nymphunder the surface

Hatch predictions

Supporters see the full sub-surface read.

Start free trial

14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Supporters see what else is on the menu.

Start free trial

14-day free trial. Cancel anytime.

Evidence
Survey-backed · regionalHigh confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
1
Sea trout runRun
1
2
2
2
2
2
2
1
Trout seasonSeason
1
2
2
2
2
2
1
March BrownHatch
2
3
2
CapererHatch
2
3
3
2
Heather FlyHatch
2
2
Autumn DunHatch
2
3
2

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Fly box · Atlantic Salmon
Beats · 1
Ogwen Valley AA — day ticket via Fishing PassportAccess varies
The Ogwen begins at Llyn Ogwen and falls rapidly through the Ogwen Falls into a string of small pools that hold wild brown trout only — the upper section is too steep and broken for migratory fish.
Visit official site ↗
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Seiont
5.0 km
Brown trout · Salmon · Sea trout
Glaslyn
23 km
Brown trout · Salmon · Sea trout
Conwy
28 km
Brown trout · Salmon · Sea trout
Dwyfor / Dwyfach
30 km
Brown trout · Salmon · Sea trout
Dwyryd
31 km
Brown trout · Salmon · Sea trout
Gallery · 2
  1. The Ogwen river flowing from Llyn Ogwen with the peak of Tryfan rising behind it.
    Afon Ogwen just after leaving Llyn Ogwen, with Tryfan in the background, Snowdonia.
  2. Terrain map of the venue
    Terrain map
Why this score · for Atlantic Salmon
  • Temperature10030% weight
  • Flow8025% weight
  • Clarity1520% weight
  • Feeding Time10015% weight
  • Pressure8510% weight
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Salmon 1 April → 17 October
  • Sea trout 3 March → 17 October
  • Trout 3 March → 30 September

Sea trout: Variable seasonal (2026) — Short Eryri spate with consistent reported sewin from the local association. Fast response means the windows are brief; All-Wales At Risk picture applies.

Related guides
Atlantic Salmonsalmon tacticsYorkshire & SpidersNorth Country methodsEuro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts
Boards & regulators